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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.security;
import android.annotation.IntDef;
import android.security.keymaster.KeymasterDefs;
import libcore.util.EmptyArray;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Collection;
/**
* Properties of {@code AndroidKeyStore} keys.
*/
public abstract class KeyStoreKeyProperties {
private KeyStoreKeyProperties() {}
@Retention(RetentionPolicy.SOURCE)
@IntDef(flag = true,
value = {Purpose.ENCRYPT, Purpose.DECRYPT, Purpose.SIGN, Purpose.VERIFY})
public @interface PurposeEnum {}
/**
* Purpose of key.
*/
public static abstract class Purpose {
private Purpose() {}
/**
* Purpose: encryption.
*/
public static final int ENCRYPT = 1 << 0;
/**
* Purpose: decryption.
*/
public static final int DECRYPT = 1 << 1;
/**
* Purpose: signing.
*/
public static final int SIGN = 1 << 2;
/**
* Purpose: signature verification.
*/
public static final int VERIFY = 1 << 3;
/**
* @hide
*/
public static int toKeymaster(@PurposeEnum int purpose) {
switch (purpose) {
case ENCRYPT:
return KeymasterDefs.KM_PURPOSE_ENCRYPT;
case DECRYPT:
return KeymasterDefs.KM_PURPOSE_DECRYPT;
case SIGN:
return KeymasterDefs.KM_PURPOSE_SIGN;
case VERIFY:
return KeymasterDefs.KM_PURPOSE_VERIFY;
default:
throw new IllegalArgumentException("Unknown purpose: " + purpose);
}
}
/**
* @hide
*/
public static @PurposeEnum int fromKeymaster(int purpose) {
switch (purpose) {
case KeymasterDefs.KM_PURPOSE_ENCRYPT:
return ENCRYPT;
case KeymasterDefs.KM_PURPOSE_DECRYPT:
return DECRYPT;
case KeymasterDefs.KM_PURPOSE_SIGN:
return SIGN;
case KeymasterDefs.KM_PURPOSE_VERIFY:
return VERIFY;
default:
throw new IllegalArgumentException("Unknown purpose: " + purpose);
}
}
/**
* @hide
*/
public static int[] allToKeymaster(@PurposeEnum int purposes) {
int[] result = getSetFlags(purposes);
for (int i = 0; i < result.length; i++) {
result[i] = toKeymaster(result[i]);
}
return result;
}
/**
* @hide
*/
public static @PurposeEnum int allFromKeymaster(Collection<Integer> purposes) {
@PurposeEnum int result = 0;
for (int keymasterPurpose : purposes) {
result |= fromKeymaster(keymasterPurpose);
}
return result;
}
}
@Retention(RetentionPolicy.SOURCE)
@IntDef({Origin.GENERATED, Origin.IMPORTED, Origin.UNKNOWN})
public @interface OriginEnum {}
/**
* Origin of the key.
*/
public static abstract class Origin {
private Origin() {}
/** Key was generated inside AndroidKeyStore. */
public static final int GENERATED = 1 << 0;
/** Key was imported into AndroidKeyStore. */
public static final int IMPORTED = 1 << 1;
/**
* Origin of the key is unknown. This can occur only for keys backed by an old TEE
* implementation which does not record origin information.
*/
public static final int UNKNOWN = 1 << 2;
/**
* @hide
*/
public static @OriginEnum int fromKeymaster(int origin) {
switch (origin) {
case KeymasterDefs.KM_ORIGIN_GENERATED:
return GENERATED;
case KeymasterDefs.KM_ORIGIN_IMPORTED:
return IMPORTED;
case KeymasterDefs.KM_ORIGIN_UNKNOWN:
return UNKNOWN;
default:
throw new IllegalArgumentException("Unknown origin: " + origin);
}
}
}
private static int[] getSetFlags(int flags) {
if (flags == 0) {
return EmptyArray.INT;
}
int result[] = new int[getSetBitCount(flags)];
int resultOffset = 0;
int flag = 1;
while (flags != 0) {
if ((flags & 1) != 0) {
result[resultOffset] = flag;
resultOffset++;
}
flags >>>= 1;
flag <<= 1;
}
return result;
}
private static int getSetBitCount(int value) {
if (value == 0) {
return 0;
}
int result = 0;
while (value != 0) {
if ((value & 1) != 0) {
result++;
}
value >>>= 1;
}
return result;
}
}
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